Entropic unfolding of DNA molecules in nanofluidic channels.

Entropic unfolding of DNA molecules in nanofluidic channels.
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DOI:
10.1021/nl802256s
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发表时间:
2008-11
期刊:
影响因子:
10.8
通讯作者:
Craighead HG
Craighead HG
中科院分区:
材料科学1区
文献类型:
--
作者:
Levy SL;Mannion JT;Cheng J;Reccius CH;Craighead HG

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限制在纳米级流体通道中的单个DNA分子沿着通道轴延伸,以使它们的构象自由能最小化。当这样的分子在施加外部电场的情况下被迫进入纳米级流体通道时,靠近DNA分子中间的单体可以首先进入,导致具有比未折叠分子更小熵的折叠构型。折叠分子的增加的自由能导致两种效应:分子的每个片段的每单位长度的延伸因子的增加,以及导致分子自发展开的空间局部化力。在具有两种不同直径的纳米通道中测量这种展开力与每DNA轮廓长度的流体动力学摩擦的比率。
Single DNA molecules confined to nanoscale fluidic channels extend along the channel axis in order to minimize their conformational free energy. When such molecules are forced into a nanoscale fluidic channel under the application of an external electric field, monomers near the middle of the DNA molecule may enter first, resulting in a folded configuration with less entropy than an unfolded molecule. The increased free energy of a folded molecule results in two effects: an increase in extension factor per unit length for each segment of the molecule, and a spatially localized force that causes the molecule to spontaneously unfold. The ratio of this unfolding force to hydrodynamic friction per DNA contour length is measured in nanochannels with two different diameters.
DOI: 10.1529/biophysj.105.074732
发表时间: 2006-06-01
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